Scalar-tensor (ST) theories of gravity are a class of modified gravity theories that were introduced in hope of finding a remedy for certain shortcomings of general relativity (GR) [1]}, [2]}, [3]}, such as the difficulty in explaining currently observed accelerated expansion of the Universe [4]}, [5]}, [6]}, [7]}, [8]}. ST theories are motivated not only by observational discrepancies between the theory and the empirical data, there are also some arguments coming from theories considered as fundamental, such as the string theory, which reproduce ST theory in their low-energy limit rather than GR [9]}.
